The cat shark I found is fat as a fool and its egg sack is nearly depleted.This way I have not done for many years, and even then it was rare that I would do it due to the egg being a saleable item so others could hatch the shark.

This one did not need to be taken out of its egg as I have done from the first one in 82 I think it was, it was already out, but fro me or friends, I always cut them out and leave the little shark in a perforated container where ti is totally safe in the current and watch it grow in that converted coke bottle.